FR2424601A1 - PROCESS FOR SERVICING THE READING SIGNAL OF AN INFORMATION MEDIA AND DEVICE FOR IMPLEMENTING IT - Google Patents
PROCESS FOR SERVICING THE READING SIGNAL OF AN INFORMATION MEDIA AND DEVICE FOR IMPLEMENTING ITInfo
- Publication number
- FR2424601A1 FR2424601A1 FR7812118A FR7812118A FR2424601A1 FR 2424601 A1 FR2424601 A1 FR 2424601A1 FR 7812118 A FR7812118 A FR 7812118A FR 7812118 A FR7812118 A FR 7812118A FR 2424601 A1 FR2424601 A1 FR 2424601A1
- Authority
- FR
- France
- Prior art keywords
- servicing
- zone
- maximum amplitude
- information media
- implementing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title abstract 3
- 238000001514 detection method Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/102—Programmed access in sequence to addressed parts of tracks of operating record carriers
- G11B27/105—Programmed access in sequence to addressed parts of tracks of operating record carriers of operating discs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
- G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
- G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/027—Analogue recording
- G11B5/035—Equalising
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Digital Magnetic Recording (AREA)
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Manipulation Of Pulses (AREA)
Abstract
PROCEDE D'ASSERVISSEMENT DU SIGNAL DE LECTURE D'UN SUPPORT D'INFORMATIONS PORTEES PAR UNE PLURALITE DE PISTES DONT LES INFORMATIONS DE REPERAGE SONT INSCRITES A L'INTERIEUR D'UNE PLURALITE DE ZONES DE REFERENCE CONTENANT CHACUNE UNE PLURALITE DE CELLULES. SELON L'INVENTION, LE PROCEDE EST CARACTERISE EN CE QU'IL CONSISTE A DETECTER POUR CHAQUE ZONE L'AMPLITUDE MAXIMUM DES SIGNAUX DE LECTURE CORRESPONDANT AUX FRONTS DE RATTRAPAGE DE CELLULES DU DEBUT DE LA ZONE ET A LA MEMORISER, A GENERER A PARTIR DE LADITE AMPLITUDE MAXIMUM, DEUX SEUILS DE DETECTION EGAUX ET DE SIGNES OPPOSES, A FAIRE LA COMPARAISON DE L'AMPLITUDE MAXIMUM ET DE L'AMPLITUDE PREDETERMINEE D'UN SIGNAL DE REFERENCE ET A AMPLIFIER LES SIGNAUX DE LECTURE DE LA ZONE, EN FONCTION DU RESULTAT DE CETTE COMPARAISON. APPLICABLE AUX MEMOIRES A DISQUES.PROCESS FOR SERVICING THE READING SIGNAL OF AN INFORMATION MEDIA CARRIED BY A PLURALITY OF TRACKS WHOSE TRACKING INFORMATION IS WRITTEN INSIDE A PLURALITY OF REFERENCE ZONES EACH CONTAINING A PLURALITY OF CELLS. ACCORDING TO THE INVENTION, THE PROCESS IS CHARACTERIZED IN THAT IT CONSISTS OF DETECTING FOR EACH ZONE THE MAXIMUM AMPLITUDE OF THE READING SIGNALS CORRESPONDING TO THE CELL CATCHING FRONTS AT THE BEGINNING OF THE ZONE AND IN STORING IT, GENERATING FROM THE SAID MAXIMUM AMPLITUDE, TWO EQUAL DETECTION THRESHOLDS AND OPPOSITE SIGNS, TO MAKE THE COMPARISON OF THE MAXIMUM AMPLITUDE AND THE PREDETERMINED AMPLITUDE OF A REFERENCE SIGNAL AND TO AMPLIFY THE READING SIGNALS OF THE ZONE, ACCORDING TO THE RESULT OF THIS COMPARISON. APPLICABLE TO DISK MEMORIES.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7812118A FR2424601A1 (en) | 1978-04-25 | 1978-04-25 | PROCESS FOR SERVICING THE READING SIGNAL OF AN INFORMATION MEDIA AND DEVICE FOR IMPLEMENTING IT |
GB7911976A GB2022886B (en) | 1978-04-25 | 1979-04-05 | Method of processing the read signal from a data carrier and arrangement for putting the method into practice |
JP4918979A JPS54143611A (en) | 1978-04-25 | 1979-04-23 | Method of and device for tracting and controlling signal read from a data carrier |
IT22080/79A IT1112524B (en) | 1978-04-25 | 1979-04-23 | PROCEDURE FOR SERVING THE READING SIGNAL OF AN INFORMATION SUPPORT, AND DEVICE TO IMPLEMENT IT |
DE19792916473 DE2916473A1 (en) | 1978-04-25 | 1979-04-24 | REGULATING PROCEDURE FOR THE READ-OUT SIGNAL OF AN INFORMATION CARRIER AND DEVICE FOR PERFORMING THE PROCESS |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7812118A FR2424601A1 (en) | 1978-04-25 | 1978-04-25 | PROCESS FOR SERVICING THE READING SIGNAL OF AN INFORMATION MEDIA AND DEVICE FOR IMPLEMENTING IT |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2424601A1 true FR2424601A1 (en) | 1979-11-23 |
FR2424601B1 FR2424601B1 (en) | 1980-09-19 |
Family
ID=9207527
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7812118A Granted FR2424601A1 (en) | 1978-04-25 | 1978-04-25 | PROCESS FOR SERVICING THE READING SIGNAL OF AN INFORMATION MEDIA AND DEVICE FOR IMPLEMENTING IT |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS54143611A (en) |
DE (1) | DE2916473A1 (en) |
FR (1) | FR2424601A1 (en) |
GB (1) | GB2022886B (en) |
IT (1) | IT1112524B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0219037A2 (en) * | 1985-10-08 | 1987-04-22 | Sharp Kabushiki Kaisha | Waveform processing circuit |
EP0369472A2 (en) * | 1988-11-17 | 1990-05-23 | Mitsubishi Denki Kabushiki Kaisha | Signal processing circuit |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4495528A (en) * | 1981-07-10 | 1985-01-22 | Victor Company Of Japan, Ltd. | Magnetic reproducing system for a digital signal |
JPS5963005A (en) * | 1982-10-04 | 1984-04-10 | Toshiba Corp | Magnetic recording system |
JPH02166670A (en) * | 1988-12-20 | 1990-06-27 | Tokico Ltd | Magnetic disk device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2071751A5 (en) * | 1969-11-26 | 1971-09-17 | Ibm | |
US3660821A (en) * | 1970-06-17 | 1972-05-02 | Burroughs Corp | Disc file agc circuit |
US3691543A (en) * | 1971-02-08 | 1972-09-12 | Ibm | Positioning system including servo track configuration and associated demodulator |
US3840756A (en) * | 1973-02-05 | 1974-10-08 | Honeywell Inf Systems | Gain control circuit using sample and hold feedback |
US3879674A (en) * | 1973-12-27 | 1975-04-22 | Burroughs Corp | Automatic gain control circuit |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4912645B1 (en) * | 1969-04-21 | 1974-03-26 | ||
US3902190A (en) * | 1973-11-23 | 1975-08-26 | Rca Corp | Programmable test of read/write circuitry by varying clipping levels |
DE2601437A1 (en) * | 1976-01-16 | 1977-07-21 | Licentia Gmbh | AF amplifier AGC circuit - has main and auxiliary RC timing elements connected in parallel |
FR2346806A1 (en) * | 1976-03-31 | 1977-10-28 | Honeywell Bull Soc Ind | MODE OF WRITING ADDRESS ON MAGNETIC RECORDING MEDIUM |
-
1978
- 1978-04-25 FR FR7812118A patent/FR2424601A1/en active Granted
-
1979
- 1979-04-05 GB GB7911976A patent/GB2022886B/en not_active Expired
- 1979-04-23 JP JP4918979A patent/JPS54143611A/en active Granted
- 1979-04-23 IT IT22080/79A patent/IT1112524B/en active
- 1979-04-24 DE DE19792916473 patent/DE2916473A1/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2071751A5 (en) * | 1969-11-26 | 1971-09-17 | Ibm | |
US3660821A (en) * | 1970-06-17 | 1972-05-02 | Burroughs Corp | Disc file agc circuit |
US3691543A (en) * | 1971-02-08 | 1972-09-12 | Ibm | Positioning system including servo track configuration and associated demodulator |
US3840756A (en) * | 1973-02-05 | 1974-10-08 | Honeywell Inf Systems | Gain control circuit using sample and hold feedback |
US3879674A (en) * | 1973-12-27 | 1975-04-22 | Burroughs Corp | Automatic gain control circuit |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0219037A2 (en) * | 1985-10-08 | 1987-04-22 | Sharp Kabushiki Kaisha | Waveform processing circuit |
EP0219037A3 (en) * | 1985-10-08 | 1989-08-30 | Sharp Kabushiki Kaisha | Waveform processing circuit |
EP0369472A2 (en) * | 1988-11-17 | 1990-05-23 | Mitsubishi Denki Kabushiki Kaisha | Signal processing circuit |
EP0369472A3 (en) * | 1988-11-17 | 1991-09-25 | Mitsubishi Denki Kabushiki Kaisha | Signal processing circuit |
Also Published As
Publication number | Publication date |
---|---|
FR2424601B1 (en) | 1980-09-19 |
JPH0135421B2 (en) | 1989-07-25 |
DE2916473A1 (en) | 1979-10-31 |
GB2022886A (en) | 1979-12-19 |
IT7922080A0 (en) | 1979-04-23 |
GB2022886B (en) | 1983-02-02 |
DE2916473C2 (en) | 1988-08-11 |
JPS54143611A (en) | 1979-11-09 |
IT1112524B (en) | 1986-01-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
FR2507038A1 (en) | METHOD FOR EXPLORING AND RECORDING IMAGES | |
FR2399088A1 (en) | APPARATUS AND METHOD FOR RESTITUTING A MODULE FREQUENCY SIGNAL STORED ON AN INFORMATION STORAGE ELEMENT | |
FR2413005A1 (en) | DEVICE FOR READING VIDEO SIGNALS INTO A DISC | |
FR2428361A1 (en) | METHOD AND DEVICE FOR RECORDING AND REPRODUCING INFORMATION | |
FR2406865A1 (en) | DEVICE FOR READING THE INFORMATION RECORDED ON A MAGNETIC MEDIA | |
FR2396379A1 (en) | OPTICAL INFORMATION DISC READER EQUIPPED WITH AN AUTOMATIC INFORMATION ACCESS DEVICE | |
GB1507316A (en) | Optical mass data memory | |
FR2415403A1 (en) | REPRODUCING DEVICE FOR AN APPARATUS FOR PLAYING BACK VIDEO SIGNALS RECORDED ON A ROTATING RECORDING MEDIA | |
FR2448196A1 (en) | DEVICE FOR THE ERASURE THERMALLY OF OPTICAL CHARACTERS RECOGNIZABLE BY THE MACHINE | |
JPS57208647A (en) | Optical disk for recording of information | |
MY122541A (en) | Method for detecting servo error, apparatus therefor, disk which maintains quality of servo error signal, method for controlling servo of disk recording/reproducing apparatus, method for detecting tracking error, and method for detecting tilt error | |
FR2358797A1 (en) | AUTOMATIC CORRECTION SYSTEM OF THE CARRIER WAVE FORM FACTOR RESULTING FROM READING AN INFORMATION MEDIA | |
EP0801382A3 (en) | Optical information recording/reproducing device and method for recording/reproducing information | |
FR2397700A1 (en) | IMPROVEMENTS IN DIGITAL SIGNAL RECORDING | |
FR2424601A1 (en) | PROCESS FOR SERVICING THE READING SIGNAL OF AN INFORMATION MEDIA AND DEVICE FOR IMPLEMENTING IT | |
FR2365178A1 (en) | METHOD OF READING ADDRESSES ON A MAGNETIC RECORDING MEDIA AND DEVICE FOR IMPLEMENTING IT | |
FR2394850A1 (en) | DEVICE FOR RECOVERING DIGITAL DATA IN LARGE CAPACITY MEMORIES | |
JPS5637A (en) | Tracking system of optical disc memory | |
AU568426B2 (en) | Apparatus for recording or reading information | |
GB1408767A (en) | Optical data storage devices | |
GB1351202A (en) | Method of and means for halographically recording and reproducing information | |
ES414578A1 (en) | Optical system for forming an image of an object in a given plane | |
FR2456363A1 (en) | HIGH SPEED REPRODUCING DEVICE FOR INFORMATION REPRODUCING APPARATUSES RECORDED ON A ROTATING RECORDING MEDIUM | |
FR2438400A1 (en) | REPRODUCING APPARATUS | |
ES427804A1 (en) | Optical recording |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |